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RISRepresentation of Subgrid-Scale Orographic Effects in a General Circulation Model. Part I: Impact on the Dynamics of Simulated January Climate
Publisher: American Meteorological Society
Abstract: Effects of subgrid-scale orography are represented in most large-scale models of the atmosphere by means of parameterizing subgrid-scale orographic gravity wave drag and/or enhancing grid-scale orography, such as ?envelope ...
Improvement of Orographic Gravity Wave Parameterization Using a Mesoscale Gravity Wave Model
Publisher: American Meteorological Society
Abstract: Parameterization of gravity waves due to subgrid-scale orography is now included in most existing large-scale models of the atmosphere. Parameterization schemes, however, have so far been evaluated mainly in view of the ...
Interaction between the MJO and Polar Circulations
Publisher: American Meteorological Society
Abstract: tropical?polar connection and its seasonal dependence are examined using the real-time multivariate Madden?Julian oscillation (MJO) (RMM) index and daily indices for the annular modes, the Arctic Oscillation (AO) and the ...
Hindcasting the January 2009 Arctic Sudden Stratospheric Warming and Its Influence on the Arctic Oscillation with Unified Parameterization of Orographic Drag in NOGAPS. Part I: Extended-Range Stand-Alone Forecast
Publisher: American Meteorological Society
Abstract: A very strong Arctic major sudden stratospheric warming (SSW) event occurred in late January 2009. The stratospheric temperature climbed abruptly and the zonal winds reversed direction, completely splitting the polar ...
Hindcasting the January 2009 Arctic Sudden Stratospheric Warming with Unified Parameterization of Orographic Drag in NOGAPS. Part II: Short-Range Data-Assimilated Forecast and the Impacts of Calibrated Radiance Bias Correction
Publisher: American Meteorological Society
Abstract: his study is Part II of the effort to improve the forecasting of sudden stratospheric warming (SSW) events by using a version of the Navy Operational Global Atmospheric Prediction System (NOGAPS) that covers the full ...
Numerical Experiments of an Advanced Radiative Transfer Model in the U.S. Navy Operational Global Atmospheric Prediction System
Publisher: American Meteorological Society
Abstract: high-order accurate radiative transfer (RT) model developed by Fu and Liou has been implemented into the Navy Operational Global Atmospheric Prediction System (NOGAPS) to improve the energy budget and forecast skill. The ...
A Nonreflecting Upper Boundary Condition for Anelastic Nonhydrostatic Mesoscale Gravity-Wave Models
Publisher: American Meteorological Society
Abstract: A sponge layer is formulated to prevent spurious reflection of vertically propagating quasi-stationary gravity waves at the upper boundary of a two-dimensional numerical anelastic nonhydrostatic model. The sponge layer ...
The Influence of Atlantic Sea Surface Temperature Anomalies on the North Atlantic Oscillation
Publisher: American Meteorological Society
Abstract: The influence of Atlantic sea surface temperature (SST) anomalies on the atmospheric circulation over the North Atlantic sector during winter is investigated by performing experiments with an atmospheric general circulation ...
Reduction of Middle-Atmospheric Forecast Bias through Improvement in Satellite Radiance Quality Control
Publisher: American Meteorological Society
Abstract: This article discusses a practical problem faced in operational atmospheric forecasting and data assimilation, and efforts to improve forecast quality through the choice of quality control parameters. The need to utilize ...
Impact of a Convectively Forced Gravity Wave Drag Parameterization in NCAR CCM3
Publisher: American Meteorological Society
Abstract: A parameterization of gravity wave drag forced by subgrid-scale cumulus convection (GWDC) proposed by Chun and Baik is implemented into the National Center for Atmospheric Research Community Climate Model (NCAR CCM3) and ...